early atmosphere

Question 1

what gases do volcanoes give off?

Answer 1

carbon dioxide, nitrogen, water vapour, methane and ammonia

Question 2

how did the atmosphere change?

Answer 2

• water vapour condensed to form oceans as the earth cooled
• lots of CO2 dissolved into the oceans, forming carbonate precipitates. these formed sediments on the sea floor.
• green plants and algae evolved and absorbed some CO2 for photosynthesis

Question 3

what % of the air is nitrogen?

Answer 3

78%

Question 4

what % of the air is oxygen?

Answer 4

21%

Question 5

what % of the air is argon?

Answer 5

1%

Question 6

what % of the air is carbon dioxide?

Answer 6

0.04%

Question 7

what are the effects of global warming?

Answer 7

• polar ice caps will melt and will increase the sea level, which will cause flooding
• change in climate and weather

Question 8

what is the greenhouse effect?

Answer 8

gases in the atmosphere trap heat that would normally be radiated to space

Question 9

what happens in the greenhouse effect?

Answer 9

the sunlight that the earth absorbs from the sun can pass through the atmosphere unaffected by the greenhouse gases. this means we can continue to absorb energy at the same rate we used to be lose less, so overall the earth gains energy.

Question 10

name some greenhouse gases

Answer 10

• carbon dioxide
• methane
• water vapour

Question 11

how is carbon dioxide released?

Answer 11

• burning fossils fuels

- deforestation

Question 12

how is methane released?

Answer 12

• decomposing plant matter
• cattle
• ice caps melting

Question 13

how is water vapour released?

Answer 13

• increase in the earths temp heats up water

- water can vaporise

Question 14

how could we help stop global warming?

Answer 14

• encourage plankton growth in the seas buy dumping scrap iron in it
• turn carbon dioxide into hydro carbons through electrolysis

Question 15

why did the amount of water vapour in the earths atmosphere decrease?

Answer 15

water vapour condensed when the earths temperature cooled down

Question 16

how did nitrogen form?

Answer 16

the suns rays split ammonia into nitrogen and hydrogen

Question 17

how come carbon is stored in sedimentary rock?

Answer 17

sea creatures used the carbon from the atmosphere to make shells. when they died their fossils were compressed into sedimentary rock.

Question 18

how did fossil fuels form?

Answer 18

marine creatures bodies were compressed to form oil